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The perfect-sized bag was proposed Tuesday by the world's largest airline association, as it aims to resolve how to squeeze everyone's carry-on luggage onto a crowded plane.

The rolling suitcase would be small enough to allow every passenger on a flight of 120 people or more to fit one bag in the overhead space near their seat, said Tom Windmuller, the International Air Transport Association (IATA) senior vice president for airport, passenger, cargo and security.

Windmuller said when he compared it to his own bags, he found it was smaller than his personal carry-on but bigger than his wife's.